Start using piecemeal includes in test files

tests/SelfTest/IntrospectiveTests/PartTracker.tests.cpp

@@ -1,14 +1,12 @@
 /*
- *  Created by Phil on 1/10/2015.
- *  Copyright 2015 Two Blue Cubes Ltd
- *
  *  Distributed under the Boost Software License, Version 1.0. (See accompanying
  *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  */
+
+#include <catch2/catch_test_macros.hpp>
 #include <catch2/catch_suppress_warnings.h>
 #include <catch2/catch_test_case_tracker.h>
 
-#include <catch2/catch.hpp>
 
 using namespace Catch;